A sensor is a device or component that detects and responds to a physical or chemical stimulus, such as light, sound, pressure, temperature, or radiation, and converts it into an electrical or digital signal that can be interpreted by a computer or other electronic system. Sensors are used in a wide range of applications, from consumer electronics to industrial automation, medical devices, environmental monitoring, and scientific research.
Detection refers to the process of identifying or sensing the presence, location, or characteristics of an object, substance, or phenomenon, using one or more sensors or detection methods. Detection can be used to measure physical or chemical properties such as temperature, pressure, humidity, or gas concentration, or to detect motion, vibration, sound, light, or electromagnetic waves. Detection is an essential part of many systems, such as security systems, environmental monitoring, medical diagnostics, and scientific experiments.